Most passengers seemed to be remarkably patient, considering the inconvenience. But the fiasco has many asking how a giant like Delta could come down so easily.

Travel expert Karen Schaler told Inside Edition, "Where's the backup plan? Shouldn't there be one system that's not on the same grid so if something like this happens they're not crippled and they can communicate?"

She added, "I think for an airline that makes billions of dollars a year, one of the largest in the world, we can expect to have a safe assumption that if something goes wrong, we're not all going to be crippled and not be able to fly."